<?php
/**
 * Ensures that object indexes are written in dot notation.
 *
 * @author    Sertan Danis <sdanis@squiz.net>
 * @copyright 2006-2015 Squiz Pty Ltd (ABN 77 084 670 600)
 * @license   https://github.com/squizlabs/PHP_CodeSniffer/blob/master/licence.txt BSD Licence
 */

namespace PHP_CodeSniffer\Standards\Squiz\Sniffs\Objects;

use PHP_CodeSniffer\Files\File;
use PHP_CodeSniffer\Sniffs\Sniff;

class DisallowObjectStringIndexSniff implements Sniff
{
    /**
     * A list of tokenizers this sniff supports.
     *
     * @var array
     */
    public $supportedTokenizers = ['JS'];

    /**
     * Returns an array of tokens this test wants to listen for.
     *
     * @return array
     */
    public function register()
    {
        return [T_OPEN_SQUARE_BRACKET];
    }

    //end register()

    /**
     * Processes this test, when one of its tokens is encountered.
     *
     * @param \PHP_CodeSniffer\Files\File $phpcsFile The file being scanned.
     * @param int                         $stackPtr  The position of the current token
     *                                               in the stack passed in $tokens.
     */
    public function process(File $phpcsFile, $stackPtr)
    {
        $tokens = $phpcsFile->getTokens();

        // Check if the next non whitespace token is a string.
        $index = $phpcsFile->findNext(T_WHITESPACE, ($stackPtr + 1), null, true);
        if (T_CONSTANT_ENCAPSED_STRING !== $tokens[$index]['code']) {
            return;
        }

        // Make sure it is the only thing in the square brackets.
        $next = $phpcsFile->findNext(T_WHITESPACE, ($index + 1), null, true);
        if (T_CLOSE_SQUARE_BRACKET !== $tokens[$next]['code']) {
            return;
        }

        // Allow indexes that have dots in them because we can't write
        // them in dot notation.
        $content = trim($tokens[$index]['content'], '"\' ');
        if (false !== strpos($content, '.')) {
            return;
        }

        // Also ignore reserved words.
        if ('super' === $content) {
            return;
        }

        // Token before the opening square bracket cannot be a var name.
        $prev = $phpcsFile->findPrevious(T_WHITESPACE, ($stackPtr - 1), null, true);
        if (T_STRING === $tokens[$prev]['code']) {
            $error = 'Object indexes must be written in dot notation';
            $phpcsFile->addError($error, $prev, 'Found');
        }
    }

    //end process()
}//end class
